Hugh m



(No Model.)

H. M. BROWNE. FIRE OR OTHER ALARM.

No. 465,829. Patented Dec..29, 1891 iii Man:

NITED STATES PATENT "OFFICE.

IIUGI-I M. BROIVNE, OF XVASHINGTON, DISTRICT OF COLUMBIA.

FIRE OR OTHER ALARM.

SPECIFICATION forming part of Letters Patent No. 465,829, dated December 29, 1891. Application filed December 24, 1890. Serial No. 375,763. (No model.)

To all whom it 71mg concern: Be it known that I, HUGH M. BROWNE, of the city of Washington, in the District of Golumbia, have invented certain new and useful Improvements in Fire or other Alarms, of which the following is a specification.

My invention has reference to fire or other alarms; and the object of the invention is to warn automatically by means of the expansive power of air in direct conjunction with the mechanism of an electric bell against fire and other excessive heat without using any intermediate clock-work or the like or the electric plant of the house.

In all the constructions heretofore in use, so far as I know, there is an intermediate mechanism which renders said constructions costly and their operations more liable to derangement. I overcome these difficulties by such a construction as will be cheap and will allow the mechanism of the bell to be operated directly by the expanding body of air.

Another objection to all the constructions heretofore in use, so far as I know, is that they depend on the domestic plant for their electricity. The constant drain on this supply and the use of the domestic system connected with it by persons possessing no knowledge of electricity render a derangement possible at any moment, by which the operation of said constructions may be entirely crippled. I overcome this objection by using a dry cell located within the apparatus itself.

Another objection to all the constructions heretofore in use, so far as I know, is the intensity of heat required to operate them. My invention overcomes this objection by using a body of air inclosed hermetically in a bulb made of glass or some other suitable material, and is hence sensitive to any change in the temperature of the room.

My invention consists in the use of an india-rubber diaphragm so situated and arranged in conjunction with a body of air, a bulb, a flat metallic bar having a disk and a hinge, a screw, a bracket, a dry cell, and the mechanismof an electric bell as to make the circuit through the bell when the said body of air expands and break the circuit when. the said body of air contracts to its former volume.

In the accompanying drawings, forming a part of this specification, Figure l is a perspective front view of my invention with the front of the casing removed. Fig. 2 isa perspective side View of the same with the top and two sides of the casing removed.

Similar letters refer to similar parts throughout the two several views.

A is the casing, containing all the several parts and mechanism of my device except the bell and a part of the screw and the bulb.

B is the electric hell.

0 is the screw.

D is thebulb containing the body of air.

E is theflat metallic bar.

F is the disk.

G is the cell.

II is the bracket through which the screw works.

I is the hinge of the flat bar.

K is the metallic band cemented on the neck of the bulb.

K is the metallic screw-ring, and 7a is the flange on said ring.

M is the india-rubber diaphragm.

N is the piece of platinum.

c and e are conducting-wires.

The metallic flat bar E is joined at one end to the. inside of the casing A by the hinge I, working freely up and. down, and rests upon the mouth of the bulb D in such a manner as to cause said flat bar to move up and down simultaneously with the up-and-down move ment of the india-rubber diaphragm M. The flat bar E, when resting horizontally upon the mouth of the bulb D, does not touch the screw 0, as shown in Fig. 3, but when raised it presses against the lower end of screw 0, as shown by dotted lines, Fig. 3. The flat bar E has apiece of platinum N on the upper side and a disk F on the lower side, as seen in Fig. 4. This disk is so constructed and arranged as to fit easily within the flange 7%) of the ring K and rest upon the diaphragm M. The purpose of this disk is to prevent lateral expansion of the diaphragm M on either side of the fiat bar 7 E. The purpose of the piece of platinum is to make a good electrical connection with the screw 0. The hinged end of the fiat bar E is joined by means of the wire 6 to the negative pole of the dry cell G.

The screw 0 is held directly over the platinum strip N on the flat bar E by means of the casingA,Fig. 1.

bracket II, as shown in Fig. 3,in such a man nor as to allow said screw to be raised or lowered. The purpose of this adjustment is to allow the alarm to be operated at different temperatures. The screw 0 is joined by means of the bracket II and wire 6' to the positive pole of the dry cell G, said wire 6' having first passed through the mechanism operating the electric bell B. The screw 0 has a platinum tip at its lower end, and marks of graduation on so much of its other end as extends above The purpose of the platinum tip is to makea good electric connection with the fiar bar E at N. The bracket H is secured to the inside of casing A opposite to hinge I, as shown in Fig. 3.

Theindia-rubber diaphragm M, Fig, 2, covers the .mouth of the bulbD and is so constructed and arranged in conjunction with the screw-band K,tl1esc1'ew-ringK,and the flange as to hermetically seal said bulb D, and permit the diaphragm M to expand Vertically.

The band K is cemented to the neck of the bulb D. andhas a screw cut on its outer surface.

The ring K hasa screw cut on its inner surface of the same pitch as the screw on K, and

is screwed down on K, as shown in Fig. 2, in such a manner as to secure by flange 7c the india-rubber diaphragm M to the rim of the bulb D air-tight, as shown in Fig. 2.

The. mechanism which operates the electric bell B is situated and arranged conveniently behind the cell G.

While I have described my flat metallic bar with a disk and hinge, my india-rubber dia-. phragm, my bulb 'filled with air, my bracket,

been adjusted to ring, the airin the bulb D expands, causing the india-rubber diaphragm M to expand upward. This raises the fiat bar Ezsufliciently to cause the platinum strip N to bear against the platinum tip of. screw 0.

This completes the electric circuit. through thebell-B, causing it to ring.

lIaving described my invention and its operation, what I claim, and desire to secure by Letters Patent, is

1. A fire or other alarm consisting of a casing containing an india-rubber diaphragm covering hermetically the mouth of a bulb filled with air, a flat bar with a disk'and hinge resting upon said diaphragm, a screw held by a bracket over the end of said flat bar opposite to the hinge, and a bulb filled with air arranged 011 the bottom of said casing, and mechanism, substantially as described, for connecting the expansion of the body of air insaid bulb with the mechanism of an electrio bell.

2. A fire-alarmcomprising a .casing, a.flat.

bar with a disk and hinge formaking anelectric connection with a screw andbracket, said. screw and bracket, an india-rubber diaphragm 3. In a fire-alarm, the flat bar E, having the diskFrand a hinge I, all combined withf-the. diaphragm M, carrying aco-ntact,-and-the bulb D, so as to make andnbreak'anelectric.-

circuit; with. the screw-O; as describechand operated in the manner substantially asset forth.

4. The diaphragm M, carrying a contact se curedto themouthofthe bulb D bythe :me-r tallic band K; ring K, andwflange it, so as to permit the vertical expansionof said diaf. phragm, and a co-operating contact, substan-- tially as described-and shown.

5. In a fire-alarm or similardevice, the com binationofthe following elements, to wi-tr, a.

bulb containing a body of air, bandK, ring K, with.fiange 7c, india-rubber diaphragm M,

flat-bar. E, having diskzF and. binge I, screw 0,-- bracket I-I, dry cell Gr, electric bell Band mechanism, and easing A, inclosing all-tot.

these several elements,except ibellBiand; a

part ofscrew O and bulb D, all operating sub-1 I stantiallyin the. manner setforth.

HUGI-I -M;. BROWNE; I Witnesses;

B. P. WATRoUs, JAMES D. DONNELLY. 4 

